JVC PC-X290 User manual

SERVICE MANUAL
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB201
2004/4
CD PORTABLE COMPONENT SYSTEM
MB20120044
PC-X290
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
SP-PCX290
CA-PCX290
SP-PCX290
SENSOR
TAPE AUX
PLAY
REC
PLAY
PHONES
P
R
E
S
E
T
U
P
/
R
E
P
E
A
T
P
R
O
G
R
A
M
/
S
E
T
N
W
O
D
T
E
S
E
R
P
O
R
T
N
I
Y
A
L
P
S
I
D
CD/
RANDOM
TUNER/
BAND
PLAY REW FF PAUSEPLAY REW FF
STOP/EJECT
PAUSE
REC
-
+
CD SYNCHRO RECORDING AUTO STOP SYSTEM
CD PORTABLE COMPONENT SYSTEM
STOP/EJECT
STANDBY
A
B
VOLUME
H
B
S
/
P
R
E
S
E
T
E
Q
STANDBY/ON
FM MODE
TAPE
CD/
RANDOM
TUNER/
BAND
Area suffix
J ---------------------------- U.S.A.
C ------------------------- Canada
SERVICE POLICY
No service part is available for this model.
Exchange only.

1-2 (No.MB201)
SPECIFICATION
Designs and specifications are subject to change without notice.
Amplifier Output Power 5 W per channel, min. RMS, driven into 3.2 Ωat 1 kHz with no more than
10% total harmonic distortion.
Audio input sensitivity/Impedance (at 1 kHz) AUX:1 000 mV/47 kΩ
Speakers/Impedance 3.2 Ω- 8 Ω
Tuner FM tuning range 87.5 MHz - 108.0 MHz
AM tuning range 530 kHz - 1 710 kHz
CD player CD Capacity 1 CD
Dynamic range 60 dB
Signal-to-noise ratio 75 dB
Cassette deck Frequency response Normal (type I) 50 Hz - 10 000 Hz
Wow and flutter: 0.15% (WRMS)
General Power requirements AC 120 V , 60 Hz
DC 12 V ("R20(SUM-1)/D(13D)" batteries (8))
Power consumption 20 W (at operation)
3 W (on standby)
Dimensions (approx.) 270 mm ×274 mm ×298 mm (W/H/D) (10 11/16 in. ×10 3/4 in. ×11 3/4 in.)
Mass (approx.) 4.1 kg (9.1 lbs)
Speaker Type 2-way bass-reflex type
Speaker units Woofer: 10 cm (4 in.) cone ×1
Tweeter: 5 cm (2 in.) cone ×1
Power handling capacity 5 W
Impedance 3.2 Ω
Frequency range 50 Hz - 18 000 Hz
Dimensions (approx.) 180 mm ×270 mm ×228 mm (W/H/D) (7 1/8 in. ×10 3/4 in. ×9 in.)
Mass (approx.) 1.7 kg (3.8 lbs) each

(No.MB201)1-3
SECTION 1
PRECAUTION
This service manual does not describe PRECAUTION.
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
SECTION 3
DISASSEMBLY
This service manual does not describe DISASSEMBLY.
SECTION 4
ADJUSTMENT
This service manual does not describe ADJUSTMENT.
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.

(No.MB201)
AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
VICTOR COMPANY OF JAPAN, LIMITED
WPC
Printed in Japan

PC-X290
HYPER-BASS
SOUND
HYPER-BASS
SOUND
Areas Suffix
J.................................................USA
C...........................................Canada
Contents
Page
Safety precautions............................................. 2 Exploded view..................................................35
Block diagram ................................................... 3 Mechanical parts list.........................................37
Disassembly instructions................................... 4 Electrolytic parts list .........................................40
Troubleshooting ................................................ 5 IC lead identification
Main adjustment................................................ 7 and transistor pin out diagrams ..............51
Wiring connections.......................................... 11 Voltage charts..................................................60
Printed circuit boards....................................... 12 Illustration of Packing and Parts List................62
Schematic diagrams........................................ 30
This service manual is made from 100% recycled paper.
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD. No.
APR. 2004
PC-X290
SERVICE MANUAL
CD PORTABLE COMPONENT SYSTEM

2
1. This design of this product contains special hardware and many circuits and components specially for
safety purposes. For continued protection, no changes should be made to the original design unless
authorized in writing by the manufacturer.Replacement parts mustbe identical to those used in the
original circuits. Services should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the
product should not be made. Any design alterations or additions will void the manufacturer warranty
and will further relieve the manufacture of responsibility for personal injury or property damage
resulting there from.
3. Many electrical and mechanical parts in the products have special safety-related characteristics.
These characteristics are often not evident from visual inspection nor can the protection afforded by
them necessarily be obtained by using replacement components rated for higher voltage, the Parts
List of Service manual. Electrical components having such features are identified by shading on the
schematics and by ( ) on the parts List in the Service Manual. The use of a substitute
replacement which does not have the same safety characteristics as the recommended replacement
parts shown in the Parts List of Service manual may create shock, fire, or other hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubing, barriers and the like to
be separated from live parts, high temperature parts, moving parts and/or sharp edges for the
prevention of electric shock and fire hazard. When service is required, the original lead routing and
dress should be observed, and it should be confirmed that they have been returned to normal, after
re-assembling.
5. Leakage current check (Electrical Shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal Parts of the
product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.)
to be sure the product is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this check.
•Plug the AC line cord directly into the AC outlet. Using a “Leakage Current Tester”, measure the
leakage current from each exposed metal parts of the cabinet, particularly and exposed metal
part having a return path to the chassis, to a known good earth ground. Any leakage current must
not exceed 0.5mA AC (r.m.s.)
•Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per
volt or more sensitivity in the following manner. Connect a 1,500Ω10W resistor paralleled by a
0.15µF AC-type capacitor between an exposed
metal part and a known good earth ground.
Measure the AC voltage across the resistor with
the AC voltmeter.
Move the resistor connection to eachexposed
metal part, particularly any exposed metal part
having a return path to the chassis, and
measure the AC voltage across the resistor. Now,
reverse the plug in the AC outlet and repeat
each measurement. voltage measured Any must
not exceed 0.75 V AC (r.m.s.). This corresponds
to 0.5 mA AC (r.m.s.).
Warning
1. This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
CAUTION Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
0.15
µ
F AC TYPE
1500
Ω
10W
Place this
probe on
each exposed
metal part.
Good earth ground
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity
PC-X290
30/MAR/200
4
Safety Precautions

3
BLOCK DIAGRAM
Tuner
TA2149 PLL
TC9257 LCD
Display Back
Light
MCU/CD
TC94A09
Remote
Control
Key Board
Remote
sensor
CD Pick
Up CD RF AMP
TA2153FN
Source
Selector
TC9422
Power AMP
TA8229PK
Speaker
Main
Voltage
Regulator Rectifier Power
Supply
CD/MCU
Voltage
Regulator AC IN
CD Servo
TA2092
For Tuner
For Tape
For MCU/CD
AUX IN
TapeB
Deck
TapeA
Deck
Tape
Section
TA8189N
Phone
PC-X290
30/MAR/2004

4
DISASSEMBLY INSTRUCTIONS
A
B
This Class B digital apparatus
complies with Canadian
ICES-003.
Cet appareil numerique de la
classe B est conforme a la
norme NMB-003 du Canada.
CC
C
OPEN OPEN
AC IN
DO NOT USE THIS UNIT
IN DIRECT SUNLIGHT
OR LEAVE THE UNIT
IN CLOSED AUT OMOBILES
(OR YACHTS, ETC.)
WHERE IT W OULD BE EXPOSED
TO THE HIGH TEMPERATURE
(ABOVE 40 C (104 F)
RL
BEAT CUT RESET
12
RL
AUX IN
ANT.
SCREW
SPEAKER IMPEDANCE MIN 3.2
DD
D
D
D
D
D
Removing Left and Right and Top side and back side
Remove all screws on left and right and back side
PC-X290
30/MAR/2004

5
TROUBLESHOOTING
Circuit Symptom Cause and Remedy
General No sound • Speakers are not connected:
Check the speaker connection.
• Wrong function is selected:
Set switch to the proper position.
• Defective volume control:
Set the volume control to a proper sound level.
• Defective earphone jack:
Replace the earphone jack.
• Defect in IC404
Check voltages. Replace if necessary.
• Defect in IC401
Check voltages. Replace if necessary.
MW No sound, weak sound
(Low sensitivity) • Improper location of unit:
Rotate or reposition the unit.
• Defect in IF T101:
Check resistance, voltage, and current. Replace as needed.
• Defect AM antenna coil L103 or oscilloscope coil L104:
Replace if necessary.
• Intermediate Frequency tuning faulty:
Readjust (see “Alignment and Adjustment”).
• RF tracking faulty:
Readjust (see ‘Alignment and Adjustment”).
• Defective IC101:
Check voltages. Replace if necessary.
• Defective IC102:
Check voltages. Replace if necessary.
• Poor contact in antenna circuit:
Check resistance and resolder.
FM No sound, weak sound
(Low sensitivity) • FM antenna not connected:
Connect the built-in or external antenna.
• Defective band selector switch:
Replace or repair the switch.
• Defective IC101:
Check voltages. Replace if necessary.
• Defective IC102:
Check voltages. Replace if necessary.
• Intermediate Frequency tuning faulty:
Readjust (see “Alignment and Adjustment”).
• Poor contact in FM antenna circuit:
Resolder or repair as required.
Tape No sound/recording,
unsteady tape sound,
weak sound
• Dirty capstan or head:
Clean the capstan or head with alcohol.
• Irregular cassette tape winding:
Replace tape.
• Defective IC201:
Check voltage. Replace if necessary.
• Defective L203:
Check voltages. Replace if necessary.
• Cassette erasure prevention tabs broken out:
Replace tape or cover tab openings with adhesive tape.
CD Cannot read the table of
content.
no sound
• Disc is inserted upside down:
Insert disc correctly.
• Disc is dirty:
Wipe clean with a soft cloth.
• Disc is scratched:
Use a new disc.
• Disc is seriously warped:
Use a new disc.
PC-X290
30/MAR/2004

6
Circuit Symptom Cause and Remedy
CD Cannot read the table of
content.
no sound
• A non-standard disc has been inserted:
Use only a brand name disc.
• Moisture has formed inside the CD deck:
Wait about 20 to 30 minutes.
• Defective Q407:
Check voltages. Replace if necessary.
• Defective IC301:
Check voltages. Replace if necessary.
• Defective IC302
Check voltages. Replace if necessary.
• Defective IC303:
Check voltages. Replace if necessary.
• Defect in the CD pickup mechanism:
Replace as required.
PC-X290

7
Main Adjustments
g
gg
gMeasuring instructions required for
adjustment
1. AM Signal generator
2. FM Signal generator
3. Inter mediate Frequency sweep generator
4. FM stereo signal generator
5. Low-frequency oscillator (oscillation frequency
50 Hz-20 kHz, 0dB output with 600 ohm impedance)
6. Attenuator (600 ohm impedance)
7. Electronic voltmeter
8. Distortion meter
9. Torque gauge (cassette for CTG-N)
10. Wow & flutter meter
11. Frequency counter meter
◊ Test tape
• Playback tape
MTT-111NS (tape speed, wow flutter)
MTT-112BN (reference level)
MTT-257C (playback frequency)
MTT-113CN
• Recording tape
MTT-501
• Power supply voltage
AC110V-120V 60Hz
g
gg
gMeasuring instruments
• Radio section
◊ FM 1 kHz, 22.5 kHz deviation
◊ FM STEREO: 1 kHz, 67.5 kHz deviation
pilot signal 7.5 kHz.
◊ AM: 1 kHz, 30% modulation
◊ Reference output:
Speaker output: 0dB (2 V)3.2 ohm
H. Phone output: - 10 dB (0.245V)/32 ohm
• Amplifier section
◊ Reference output:
Speaker output 0 dB (2 V)/ 3.2 ohm
H. Phone output – 10 dB (0.245V)/32 ohm
• CD section
◊ Test disc:SONY Yeds 7 Type 3
PHILIPS SBC-444A
A-BEX: TCD-731R
TCD-712R
TCD-785
PC-X290
30/MAR/2004

8
! Cassette Amplifier Section
Item Measuring Condition Check and adjustment procedure Standard value Adjusting part
Head azimuth
adjustment • Test tape:
MTT113CN (8 kHz)
• Signal output
terminal:
PHONES
(with 32 ohm load)
1.Play back the test MTT113CN (8 kHz).
2.Adjust the head azimuth adjusting screw so that
the phase difference between the R and L
channels is minimized at an output level that is
within ±2 dB of the maximum output level . After
this adjustment, lock the head azimuth adjusting
screw with screw sealant to cover more than a
half of the screw head.
3.When the head azimuth is maladjusted, correct it
with the head azimuth adjusting screw.
• Output level:
• Within ±2 dB of
maximum output
level
• Phase difference
L and R
channels:
Minimum
Head azimuth
adjusting
screw (To be
used only
after head
replacement)
See Fig 3-1
PB frequency
response check • Test tape:
MTT257C
• Signal output
terminal:
PHONES
(with 32 ohm load)
Play back the test tape MTT257C while con-firming
that deviation between the 1 kHz signal and 8 kHz
signal should be 0 (+3~-6) dB.
Deviation between
1 kHz and 8 kHz:
0 (+3~-6) dB
Bias frequency
check • Tape: Normal
• Signal output
terminal: Cassette
REC./PLAY HEAD
Set the TUNER or CD function and with TAPE to
record. check to see if the frequency at the
measuring point R201 or R202 is 82 kHz ±1 kHz. if
not adjust L203 until the frequency counter
indicates 82 kHz ± 1 kHz.
L203,
R201/R202
See Fig 3-2
REC and PB
frequency
response
adjustment
• Test tape: MTT-501
• Signal input FM22.5
DEV 60dBµwith
Emphasis
• signal output
terminal: PHONES
(with 32 ohm load)
At TUNER, set the BAND to the FM position, and
record the reference 1 kHz signal and 8 kHz signal
alternately repeatedly. While playing back the
recorded signal differ from that of the 1 kHz signal
by within 0 (+3~-6) dB.
Level difference
between REC and
PB:Within 0 (+3~-6)
dB.
PC-X290

9
! Tuner Section
Item Measuring
Condition Check and adjustment procedure Standard value Adjusting part
AM IF
adjustment Signal input: Loop ANTENNA
Signal output:
IC101 PIN (16)
1.Set the intermediate frequency sweep generator to
AM 450 kHz.
2.Adjust the T101 for maximum and center output
• T101
See Fig 3-2
AM tracking
adjustment Signal input: Loop antenna
PHONES (with 32
ohm Load)
1.Set the TUNER at 530 KHz adjust L104 until the
test pin of R107 voltage at 1.5 V ±0.05V.
2.Set the TUNER at 1710 KHz, Check the pin of
R107 Voltage at 7.5V ±0.5V.
3.Set the TUNER and S/G at 610KHz, adjust L103
for maximum output.
4.Set the TUNER and S/G at 1400KHz, adjust TC102
for maximum output.
5.Repeat the above steps 3 and 4.
• L104
• L103
• TC102
See Fig 3-2
FM tracking
adjustment Signal input: Antenna
Signal output:
IC101 PIN (16)
1.Set the TUNER at 87.5MHz adjust L102 until the
test pin of R105 voltage at 2.3 V ±0.05V.
2.Set the TUNER at 108MHz, Check the pin of
R105 Voltage at 7.5V ±1V.
3.Set the TUNER and S/G at 90.1MHz, adjust L101
for maximum output.
4.Set the TUNER and S/G at 106.1MHz, adjust
TC101 for maximum output.
5.Repeat the above steps 3 and 4.
• L102
• L101
• TC101
See Fig 3-2
PC-X290

10
Location of adjusting parts
! Cassette mechanism section
Figure 3-1 Head Output Signal
• Main board assembly
R201
L203
IC201
R202
T101
L104
TC102
L101
L103
IC101
TC101
L102
Figure 3-2
PC-X290

11
WIRING CONNECTIONS
PC-X290

JVC ASIA PTE., LTD.
101 Thomson Road, 28-04 United Square Singapore 307591.
(No. )
PC-X290
Printed in Japan
0001 (V)

PCX290
31/MAR/2004
Printed circuit boards
Top view
12
Main board

Top view
13
PCX290
Main board

Main board
Top view
14
PCX290

Bottom view
15
PCX290
Main board